IEEE C802.16m-09/0054r5
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed MSCCH Allocation Scheme for Multi-Carrier
Date
Submitted
2009-01-14
Source(s)
Nan Li, Li Wang, Yuqin Chen
ZTE Corporation
Voice:
E-mail: li.nan25@zte.com.cn
chen.yuqin@zte.com.cn
Chun-Yen Wang, Chun-Yuan Chiu, FangChing Ren, Richard Li
E-mail : ChunYen@itri.org.tw
ITRI
Re:
Call for Contributions and Comments on Project 802.16m System Description Document (SDD)
issued on 2008-12-12 (IEEE 802.16m-08/052), on the SDD Section 19.4
Abstract
This contribution suggests a MSCCH allocation scheme for multi-carrier.
Purpose
For review and discussion by IEEE 802.16m TG
Notice
Release
Patent
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Proposed MSCCH Allocation Scheme for Multi-Carrier
Nan Li, Li Wang, Yuqin Chen
ZTE
Chun-Yen Wang, Chun-Yuan Chiu, Fang-Ching Ren, Richard Li
ITRI
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IEEE C802.16m-09/0054r5
1. Introduction
IEEE 802.16m shall provide support for an enhanced multicast broadcast service (E-MBS), providing
enhanced multicast and broadcast spectral efficiency [1].It has been agreed that E-MBS may be transmitted via a
dedicated carrier or a unicast/E-MBS mixed carrier. In detail, there could be three kinds of carrier application
scenarios in IEEE 802.16m system: both mixed carrier and dedicated carrier, mixed carrier only and dedicated
carrier only. Based on the consensus on frame and control channel structure, this contribution proposes a
multicast service control channel (MSCCH) allocation scheme under these three scenarios for multi-carrier in
IEEE 802.16m system.
2. MSCCH allocation scheme for multi-carrier
In the current SDD text [2], SBCH is used to provide a pointer for the AMS to find the location of MSCCHs
and MSCCH is used to indicate physical layer parameters of MBS data channels for each service using joint
coding. SBCH and MSCCH may a
lso include other E-MBS control information, such as MBS zone ID list, MBS resource allocation information,
etc. The E-MBS control information should be classified based on the carrier application scenario.
2.1 Scenario 1: mixed carriers coexisting with dedicated carrier
E-MBS control information is classified into two levels:
Information carried in SBCH:
– MBS zone ID list indicating which zones the serving BS belongs to；
– Each MBS zone resource allocation information, may include the pointers to MSCCHs for each MBS zone
on each carrier, MBS scheduling interval, and MBS resource allocation pattern, etc.;
– etc.
Information carried in MSCCH:
– MBS service and carrier mapping list (could be only included in the MSCCH carried in fully configured
carrier);
– Service data scheduling information and physical layer parameters, such as MCS.
– MBS control information update indicator;
– Service start indication，service stop indication;
– etc.
When a multi-carrier AMS completes access with one of the fully configured carriers and takes this carrier as its
primary carrier, by the classification described above, it acquires MBS zone ID list, the location of MSCCHs
and MBS zone resource allocation information from SBCH on its primary carrier. If the AMS is interested in EMBS service, it shall continue to read MSCCH on its primary carrier for the MBS service and carrier mapping
list. A carrier switch may be executed if the service which the AMS cares is not on the current carrier. After
switching, the AMS could continuously receive the E-MBS data which is indicated by the MSCCH on this
carrier. MSCCH may also carry control information update indicator to indicate content change of SBCH or
MSCCH, or both. The MSCCH may be transmitted periodically for reliability. The period is FFS.
SBCH carrying E-MBS control information can be configured on all fully configured carriers. MSCCH should
be configured on all carriers which carry E-MBS traffic. The allocation of MSCCHs of different MBS zone on
each carrier is shown as Fig.1.
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IEEE C802.16m-09/0054r5
Primary carrier
(fully configured)
...
Secondary carrier 1
(fully configured)
...
Secondary carrier 2
(partially configured,
dedicated carrier)
...
SBCH
MSCCH
for MBS zone A
MSCCH
for MBS zone B
MBS zone A
Traffic
MBS zone B
Traffic
Fig.1 MSCCH Allocation under Scenario 1
2.2 Scenario 2: mixed carrier only
Under scenario 2, there are only mixed carriers in the system for E-MBS.E-MBS control information
classification is the same as scenario 1, allocation of MSCCHs of different MBS zone on each carrier is shown
in Fig.2.
Primary carrier
Fully configured
...
Secondary carrier
Fully configured
...
Secondary carrier
Partially configured
...
SBCH
MSCCH
for MBS zone A
MSCCH
for MBS zone B
MBS zone B
Traffic
MBS zone A
Traffic
Fig. 2 MSCCH Allocation under Scenario 2
2.2 Scenario 3: dedicated carrier only
E-MBS data could be transmitted only on dedicated carrier. In this case there is no need to allocate E-MBS
subframes like scenario 1and scenario 2 in mixed carrier scenarios, which mean the parameters such as MBS
scheduling interval, and MBS resource allocation pattern need not to be sent by the ABS.
Classify E-MBS control information into two levels:
Information carried in SBCH:
– MBS zone ID list indicating which zones the serving BS belongs to；
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IEEE C802.16m-09/0054r5
– The location of MSCCHs on each dedicated carrier;
– MBS service and carrier mapping list;
– etc.
Information carried in MSCCH:
– Service data scheduling information and physical layer parameters, such as MCS;
– The location of the next MSCCH;
– Service start indication，service stop indication;
– MBS control information update indicator;
– etc.
SBCH carrying E-MBS control information can be configured on all fully configured carriers. MSCCH should
be configured on all carriers which carry E-MBS traffic. Allocation of MSCCHs on each carrier in scenario 3 is
shown in Fig.3.
Primary carrier
Fully configured
...
EMBS dedicated
carrier 1
...
EMBS dedicated
carrier 2
...
SBCH
MSCCH
for MBS zone A
MSCCH
for MBS zone B
MBS zone A
Traffic
MBS zone B
Traffic
Fig. 3 MSCCH Allocation under Scenario 3
4. Conclusion
In this contribution, we discuss three carrier application scenarios in IEEE 802.16m E-MBS transmission. Under
each scenario, the E-MBS control information may be classified into two levels (SBCH and MSCCH). SBCH
carrying E-MBS control information can be allocated on all fully configured carriers. It may contain MBS zone
ID, MBS zone resource allocation information and MSCCH location information, etc. .These information are
useful for the unicast AMS for the reason that it can transfer into power saving mode when E-MBS data is
multiplexed with unicast traffic using TDM. Also, in FDM,the unicast AMS should know the control block
allocation when E-MBS multiplexed with unicast traffic.
MSCCH should be configured on all carriers which carry E-MBS traffic. It may contain scheduling information
and transmission mode for AMSs to decode E-MBS data.
Locate MSCCH/S-MSCCH of each E-MBS zone on E-MBS traffic carrier benefits the minimum bandwidth
capacity terminals and carrier switch AMS. The AMS which can only connect to one carrier at one time may
continuously receive E-MBS data on secondary carrier without getting back to primary carrier frequently if there
is no update in SBCH.
5. References
[1] IEEE 802.16m-07/002r7, “802.16m System Requirements”
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IEEE C802.16m-09/0054r5
[2] IEEE 802.16m-08/003r6, “IEEE 802.16m System Description Document”
Text Proposal for SDD
The following text is proposed to be adopted in the IEEE 802.16m system description document.
---------------------------------------------------- Start of the Text Proposal ---------------------------------------------[Insert the following text into this section]
19.4.10.X E-MBS control channel structure
SBCH carrying E-MBS control information can be configured on all fully configured carriers. It may contain
MBS zone ID list, EMBS region and pointers to MSCCH for each zone on each carrier which carries E-MBS
traffic, and E-MBS scheduling interval etc.
MSCCH should be configured on each carrier which carries E-MBS traffic. It may contain scheduling
information and transmission mode for AMSs to decode E-MBS data.
-----------------------------------------------------End of the Text Proposal ----------------------------------------------
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